fix extra kwargs error: keyword_extraction.

add lazy_external_load to reduce external lib deps whenever it's not necessary for user.

lightrag/lightrag.py

@@ -40,14 +40,6 @@ from .storage import (
     NetworkXStorage,
 )
 
-from .kg.neo4j_impl import Neo4JStorage
-
-from .kg.oracle_impl import OracleKVStorage, OracleGraphStorage, OracleVectorDBStorage
-
-from .kg.milvus_impl import MilvusVectorDBStorge
-
-from .kg.mongo_impl import MongoKVStorage
-
 # future KG integrations
 
 # from .kg.ArangoDB_impl import (
@@ -55,6 +47,30 @@ from .kg.mongo_impl import MongoKVStorage
 # )
 
 
+def lazy_external_import(module_name: str, class_name: str):
+    """Lazily import an external module and return a class from it."""
+
+    def import_class():
+        import importlib
+
+        # Import the module using importlib
+        module = importlib.import_module(module_name)
+
+        # Get the class from the module
+        return getattr(module, class_name)
+
+    # Return the import_class function itself, not its result
+    return import_class
+
+
+Neo4JStorage = lazy_external_import(".kg.neo4j_impl", "Neo4JStorage")
+OracleKVStorage = lazy_external_import(".kg.oracle_impl", "OracleKVStorage")
+OracleGraphStorage = lazy_external_import(".kg.oracle_impl", "OracleGraphStorage")
+OracleVectorDBStorage = lazy_external_import(".kg.oracle_impl", "OracleVectorDBStorage")
+MilvusVectorDBStorge = lazy_external_import(".kg.milvus_impl", "MilvusVectorDBStorge")
+MongoKVStorage = lazy_external_import(".kg.mongo_impl", "MongoKVStorage")
+
+
 def always_get_an_event_loop() -> asyncio.AbstractEventLoop:
     """
     Ensure that there is always an event loop available.

lightrag/llm.py

@@ -1074,6 +1074,8 @@ class MultiModel:
         self, prompt, system_prompt=None, history_messages=[], **kwargs
     ) -> str:
         kwargs.pop("model", None)  # stop from overwriting the custom model name
+        kwargs.pop("keyword_extraction", None)
+        kwargs.pop("mode", None)
         next_model = self._next_model()
         args = dict(
             prompt=prompt,